120 µH unshielded wirewound in 1812
The Murata LQH43MN121J03L is a drum-core wirewound inductor with a nominal inductance of 120 µH at a test frequency of 1 MHz, rated for 150 mA continuous current.
Self-resonant and Q factor
A self-resonant frequency (SRF) of 6.2 MHz means the inductor behaves inductively up to that point; above SRF the impedance turns capacitive, so the part is suited for filtering and DC-DC conversion up to the low-MHz range. The Q factor of 40 at 796 kHz indicates moderate AC losses at that frequency — adequate for general-purpose filtering and decoupling in power supply outputs and signal conditioning where the Q is not the primary selection constraint.